We know the problems, and we know the solution: sustainable development. The issue is the political will.

We can debate this or that aspect of climate change, but the reality is that most people now accept our climate is indeed subject to change as a result of greenhouse gas emissions.

People know where I stand in the Labour party and what I believe in.

The great advantage of the Lib Dems is precisely that no-one knows what they stand for.

We are going to expand enormously -- our economy, our consumption, over the years to come ... But the consequences of that on emissions are going to be severe unless we change direction.

I hope that people know me well enough and realise that I would never do anything to harm the country or anything improper. I never have. I think most people who have dealt with me think I am a pretty straight sort of a guy.

When my parents were growing up the world's population was under three billion. During my children's lifetime, it is likely to exceed nine billion. You don't need to be an expert to realise that sustainable development is going to become the greatest challenge we face this century